Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-03-14
JHEP 1105:034,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
LaTeX 21 pages. Added several references and comments, and an appendix to study the validity of the effective operator approxi
Scientific paper
10.1007/JHEP05(2011)034
We use an effective operator framework to study the contributions to the Tevatron t tbar asymmetry from arbitrary vector bosons and scalars, and compare with their effect on the t tbar tail at LHC. Our study shows, for example, that models reproducing the t tbar asymmetry by exchange of Z' and W' bosons or colour-triplet scalars lead to a large enhancement in the t tbar tail at LHC. This fact can be used to exclude these models as the sole explanation for the asymmetry, using the data already collected by CMS and ATLAS. Our analysis is model independent in the sense that we scan over all possible extra particles contributing to the asymmetry, and allow for general couplings. We also explore a class of Standard Model extensions which can accommodate the Tevatron asymmetry without contributing to the total t tbar cross section at first order, so that the enhancement of the tail at Tevatron and LHC is moderate.
Aguilar-Saavedra Juan Antonio
Perez-Victoria Manuel
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